The type of technology (discriminated primarily according to
feeder mechanism type) employed by the input sub-unit. Note,
the Optional Input Class provides for a descriptor field to
further qualify the other choice.
Additional information:
Tray 1 is the multi-purpose tray and is always present.
It supports both sheets and envelopes. Its type is
ePsheetFeedAutoNonRemovableTray.
Tray 2 is a removable tray that comes standard
with the printer, although it is usually not removed
from the printer. It is type
ePsheetFeedAutoRemovableTray.
Tray 3 is an optional Lower Cassette unit that can be
attached to the printer. It is
type ePsheetFeedAutoRemovableTray.
The tray 3 object does not exist when that option
is NOT installed.